JPWO2020070780A1 - Disposable diapers - Google Patents

Abstract

The disposable diaper of the present invention includes an absorber, a non-skin surface sheet arranged on the non-skin facing surface side of the absorber, and an outer surface sheet arranged on the non-skin facing surface side of the non-skin surface sheet. It has a ventral portion arranged on the ventral side of the wearer, a lower crotch portion arranged on the crotch portion, and a dorsal portion arranged on the dorsal side in the wearing state. The absorber has a low basis weight portion at any position from the inseam to the dorsal portion, the basis weight of which is relatively lower than that of other parts of the absorber. In a disposable diaper, an outer surface sheet and a sheet located on the skin-facing surface side of the outer surface sheet are joined by an adhesive, whereby a plurality of joints extending in the longitudinal direction of the diaper are formed. The plurality of joints are located in an area overlapping the low basis weight portion. Of the regions, the lateral regions located on both sides in the diaper width direction have a higher basis weight of the adhesive than the central region located in the central region in the width direction.

Description

The present invention relates to disposable diapers.

Diapers that prevent the leakage of relatively high-moisture excrement such as watery stool and muddy stool to the outside have been proposed. For example, Patent Document 1 describes a diaper in which a pocket forming portion having a pocket that can be opened downward is formed in a rear waist region. In the same document, the pocket forming portion extends upward from the bilateral fixed portions fixed to the band-shaped region, the outer pocket region located on the extension of the absorber, and the bilateral portions of the inner and outer pocket regions. It is also described that it has a formed pocket bilateral region, the lateral dimension of the pocket medial region at the formation is reduced, and the pocket bilateral region is bent laterally inward. ..

Japanese Unexamined Patent Publication No. 2016-67958

The present invention includes an absorber, a non-skin surface sheet arranged on the non-skin facing surface side of the absorber, and an outer surface sheet arranged on the non-skin facing surface side of the non-skin surface sheet, and is in a wearing state. A disposable diaper having a ventral portion arranged on the ventral side of the wearer, a crotch portion arranged on the crotch portion, and a dorsal portion arranged on the dorsal side. The absorber has a low basis weight portion at any position from the inseam to the dorsal portion, the basis weight of which is relatively lower than that of other parts of the absorber. The outer surface sheet and the sheet located on the skin-facing surface side of the outer surface sheet are joined by an adhesive, thereby forming a plurality of joints extending in the longitudinal direction of the diaper. The plurality of joints are located in a region overlapping the low basis weight portion in the thickness direction. Of the above-mentioned regions, the lateral regions located on both sides in the diaper width direction provide a disposable diaper in which the basis weight of the adhesive is higher than that of the central region located in the central region in the width direction. Is.

FIG. 1 is a perspective view schematically showing a natural state of the disposable diaper of the present invention. FIG. 2 is a developed plan view schematically showing the skin-facing surface side (inner surface side) of the diaper shown in FIG. 1 in the expanded and extended state. FIG. 3 (a) is a cross-sectional view showing an embodiment of the diaper shown in FIG. 2 along the line AA, and FIG. 3 (b) shows an embodiment of the diaper shown in FIG. 2 taken along the line BB. It is sectional drawing which shows. 4 (a) is a plan view showing an embodiment of the diaper absorber shown in FIG. 2, and FIG. 4 (b) is a side view of the absorber of FIG. 4 (a) along the line I-I. be. FIG. 5 is a schematic view showing an embodiment of a joint portion on the outer surface sheet. FIG. 6 is a perspective view schematically showing a state after use of the disposable diaper of the present invention. FIG. 7 is a schematic view showing another embodiment of the joint portion in the outer surface sheet. FIG. 8 is a cross-sectional view showing another embodiment of the diaper shown in FIG. 2 along the line AA. FIG. 9 is a plan view showing still another embodiment of the diaper absorber shown in FIG.

Detailed description of the invention

Since the diaper described in Patent Document 1 has a pocket formed on the back side thereof, the absorbent body protrudes on the skin-facing surface side of the diaper, which impairs the wearing feeling. Further, in the diaper described in the same document, the dorsal portion of the diaper swells due to the formation of pockets, which impairs the appearance of the diaper.

Therefore, the present invention relates to disposable diapers and methods for producing the same, which can solve the shortcomings of the prior art.

Hereinafter, the disposable diaper of the present invention will be described based on its preferred embodiment. 1 to 3 show a pants-type disposable diaper, which is an embodiment of the disposable diaper of the present invention. The diaper 1 is located between the ventral portion F arranged on the ventral side of the wearer and the dorsal portion R arranged on the dorsal side in the wearing state, and arranged in the crotch portion of the wearer. It has a crotch M to be made. These members extend continuously in the front-back direction of the wearer. The diaper 1 has a diaper longitudinal direction X extending from the ventral side of the wearer to the dorsal side via the crotch portion (hereinafter, this is also simply referred to as “longitudinal direction X”) and a diaper width direction Y (hereinafter, diaper width direction Y) orthogonal to the diaper longitudinal direction X. , This is also simply referred to as "width direction Y").

As shown in FIGS. 1 and 2, the diaper 1 has an absorbent main body 2 including an absorbent body 23 capable of absorbing and holding excrement, and an exterior body arranged on the non-skin facing surface side of the absorbent main body 2. It has 3 and. In the diaper 1, the ventral side edges and the dorsal side edges are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal, and the pair of side seal portions S, S, In addition, a waist opening WH through which the wearer's torso is passed and a pair of leg openings LH through which the wearer's lower limbs are passed are formed. Details of the exterior body 3 will be described later.

Although not shown, the diaper of the present invention may be a so-called deployable disposable diaper instead of the above-described embodiment. That is, a pair of fastening tapes may be formed on both side edges of the back side portion R of the diaper 1 along the longitudinal direction X, instead of the pair of side seal portions S and S. A fastening portion is attached to the fastening tape, and a fastening region is formed on the non-skin facing surface of the ventral side F of the diaper 1 so that the fastening portion of the fastening tape can be detachably fastened. There is. The landing region is formed by joining and fixing to the non-skin facing surface of the non-skin facing surface forming the non-skin facing surface of the ventral side F.

In the present specification, the "skin facing surface" is a surface facing the wearer's skin side when wearing the diaper when focusing on the diaper or its constituent members (for example, an absorbent body), and is a "non-skin facing surface". Is the surface that faces the opposite side of the skin when wearing the diaper. That is, the skin-facing surface is the surface relatively close to the wearer's skin, and the non-skin-facing surface is the surface relatively far from the wearer's skin. “When worn” refers to a state in which the proper wearing position of the diaper is maintained.

As shown in FIG. 1, the diaper 1 has a waist circumference W arranged around the waist of the wearer when worn between the waist opening WH and the leg opening LH. The waist circumference W is a region at the same position in the longitudinal direction X as the side seal portion S in the diaper 1, and in the present embodiment, the ventral portion F is the ventral waist circumference W and the dorsal portion R is. It is the waist circumference W on the dorsal side.

As shown in FIG. 2, the absorbent main body 2 has a substantially rectangular shape in the unfolded and extended state of the diaper 1, and is arranged from the ventral side F to the dorsal side R. The absorbent main body 2 is arranged at the center of the exterior body 3 in the width direction Y so that the longitudinal direction thereof coincides with the longitudinal direction X of the diaper 1. The absorbent body 2 is joined to the exterior body 3 by a joining means such as an adhesive. The "unfolded and stretched state" of the diaper 1 means that the diaper 1 is separated by the side seal portion S or the fastening portion of the fastening tape and the landing area are released to be in the unfolded state. A state in which the diaper 1 is extended to the design dimension (the same as the dimension when the diaper 1 is expanded in a plane shape without any influence of the elastic member).

As shown in FIGS. 2 and 3, the absorbent main body 2 has a liquid-permeable skin surface sheet 21 that forms a skin-facing surface and a liquid-impermeable (including water-repellent) surface that forms a non-skin-facing surface. A non-skin surface sheet 22 and a liquid-retaining absorber 23 interposed between the two sheets 21 and 22 are provided. The absorber 23 is formed by coating an absorbent core 231 having an absorbent performance on a liquid-permeable core wrap sheet 232. The absorber 23 is in direct contact with the skin surface sheet 21 and the non-skin surface sheet 22, respectively.

The absorber 23 in the absorbent body 2 has a low basis weight at any position from the crotch portion M to the dorsal side R in the longitudinal direction X, and the basis weight is relatively lower than other parts of the absorber 23. It has a part 2L. The low basis weight portion 2L may be located only in the crotch portion M or only in the dorsal side portion R in the longitudinal direction X, and may be located in both the crotch portion M and the dorsal side portion R. It may be located. Further, the low basis weight portion 2L may be present in the entire area in the width direction Y, or may be present in a part thereof. The absorber 23 shown in FIG. 4A has a single low basis weight portion 2L only in the entire area of the dorsal side portion R in the longitudinal direction X and the width direction Y, and the crotch portion M has a low basis weight. Part 2L does not exist. As shown in FIG. 4B, the skin-facing surface side of the absorber 23 is recessed toward the non-skin-facing surface side of the low basis weight portion 2L, and the thickness of the low basis weight portion 2L gradually decreases toward the edge of the dorsal side portion R. doing.

The absorber 23 has a high basis weight portion 2H having a basis weight higher than that of the low basis weight portion 2L. The boundary between the low basis weight portion 2L and the high basis weight portion 2H may be a step, unlike the form shown in FIG. 4 (b). The high basis weight portion 2H may be present in two places or more separately in the absorber 23. In that case, the two or more high basis weight portions 2H may have the same basis weight or different basis weights. When there are three or more regions having different basis weights in the absorber 23, the region having the lowest basis weight is defined as the low basis weight portion 2L, and the other regions are defined as the high basis weight portion 2H. The low basis weight portion 2L may be present at any position from the crotch portion M to the dorsal side portion R, and may be present at any other position if necessary.

As the skin surface sheet 21, the non-skin surface sheet 22, and the absorber 23, those conventionally used for the absorbent article can be used without particular limitation. For example, as the skin surface sheet 21, various non-woven fabrics, perforated films, and the like can be used, and as the non-skin surface sheet 22, a resin film, a laminate of the resin film and the non-woven fabric, and the like can be used. As the absorbent body 23, as the absorbent core 231, an aggregate of hydrophilic fibers such as wood pulp and a hydrophilized synthetic fiber, or an aggregate in which a water-absorbing polymer is retained can be used. As the core wrap sheet 232, the same one as the skin surface sheet 21 can be used.

As shown in FIG. 3, the outer surface sheet 25 is arranged on the non-skin facing surface side of the non-skin surface sheet 22 in the absorbent main body 2. It is preferable that the outer surface sheet 25 is arranged at least in the inseam M of the absorbent body 2 and extends to the ventral side F and the dorsal side R via the inseam M. Of the outer surface sheet 25, the portions located on the ventral side F and the dorsal side R are at least arranged between the absorbent main body 2 and the exterior body 3 described later. The outer surface sheet 25 may be exposed to the outer surface of the diaper 1 only on the inseam M, and the outer body 3 further covers the inseam M, so that any of the ventral portion F, the inseam M, and the dorsal portion R It does not have to be exposed.

Returning to FIG. 2, the diaper 1 includes an exterior body 3. The exterior body 3 is arranged on the non-skin facing surface side of the outer surface sheet 25, and is a member forming the outer surface of the diaper 1. As shown in FIG. 2, the peripheral edge of the exterior body 3 forms at least the contour lines of the ventral side F and the dorsal side R of the diaper 1. The exterior body 3 located on the ventral side F and the dorsal side R has a rectangular shape in which the length in the width direction Y is longer than that in the longitudinal direction X, and these form the waist circumference portion W. That is, in the diaper 1 shown in FIG. 2, the exterior body 3 is divided into a dorsal exterior body 3R arranged on the back side of the wearer and a ventral exterior body 3F arranged on the ventral side, and is an absorbent main body. 2 is in a form of being bridged and fixed between the dorsal exterior body 3R and the ventral exterior body 3F. Instead of this, the diaper of the present invention may have a shape in which the exterior body 3 is continuously arranged over the inseam M in addition to the ventral side F and the dorsal side R.

As shown in FIG. 3B, in the exterior body 3, the outer layer non-woven fabric 31 forming the non-skin facing surface of the diaper 1 in the worn state and the inner layer non-woven fabric 32 arranged on the skin facing surface of the outer layer non-woven fabric 31 are laminated. It is composed including the body. In the wearing state of the diaper 1, the outer layer non-woven fabric 31 forms the non-skin facing surface of the diaper 1, and the inner layer non-woven fabric 32 forms the skin facing surface of the diaper 1. The outer-layer non-woven fabric 31 and the inner-layer non-woven fabric 32 are joined to each other at a predetermined portion via a joining means such as an adhesive. In relation to the outer surface sheet 25, the inner layer non-woven fabric 32 is arranged on the non-skin facing surface side of the outer surface sheet 25, and the outer layer non-woven fabric 31 is arranged on the non-skin facing surface side of the inner layer non-woven fabric 32.

In FIG. 3B, the space between the outer layer non-woven fabric 31 and the inner layer non-woven fabric 32 and the space between the inner layer non-woven fabric 32 and the outer surface sheet 25 are shown separately, but this is for convenience of explanation. In reality, each non-woven fabric and sheet are not separated, and joining or the like (not shown) is performed.

As shown in FIGS. 1 and 2, a plurality of thread-like or strip-shaped second elastic members 33 are arranged between the outer-layer non-woven fabric 31 and the inner-layer non-woven fabric 32 at intervals in the longitudinal direction X of the diaper. There is. Each of the second elastic members 33 extends along the diaper width direction Y, and a plurality of the second elastic members 33 are arranged and fixed between the outer-layer non-woven fabric 31 and the inner-layer non-woven fabric 32 in the stretched state. Due to the contraction of the second elastic member 33, gathers around the waist are formed on the waist circumference W when the diaper 1 is worn. The waist circumference gathers are formed so as to extend along the width direction Y, which is the stretchable direction of the second elastic member 33.

As shown in FIGS. 3 and 5, the outer surface sheet 25 and the sheet located on the skin-facing surface of the outer surface sheet 25 are joined by an adhesive, whereby the diaper extends in the longitudinal direction X of the diaper and is discontinuous in the width direction Y. A plurality of joints 27 formed in the above are formed. The joint portion 27 is formed so as to be located in a region overlapping the low basis weight portion 2L of the absorbent main body 2 in the thickness direction and extending in the longitudinal direction X in the plan view of the diaper 1. The joint portion 27 is a joint portion 27a (hereinafter, also referred to as “central joint portion 27a”) formed in a central region located in the central region of the diaper 1 in the width direction Y, and both sides in the width direction Y. It is composed of a joint portion 27b (hereinafter, also referred to as a “side joint portion 27b”) formed in a lateral region located in the region, and they overlap with the low basis weight portion 2L in the thickness direction. The central joint portion 27a is formed by joining the outer surface sheet 25 with the non-skin surface sheet 22 in the Y central region in the width direction thereof. Further, the lateral joint portion 27b is formed by joining the outer surface sheet 25 with the intermediate sheet 29 described later in both side regions in the width direction Y thereof. The region where the joint portion 27 and the low basis weight portion 2L of the absorbent main body 2 overlap in the thickness direction is composed of a central region 27C and a lateral region 27S. The central region 27C includes the central joint portion 27a and is located at the center in the diaper width direction. The lateral region 27S is located laterally in the diaper width direction with the central region 27C in between. The central region 27C and the lateral region 27S have different adhesive basis weights, and preferably the lateral region 27S has a higher adhesive basis weight than the central region 27C.

Specifically, (1) each of the joint portions 27a and 27b existing in 27C and 27S in each region is formed by the same amount of adhesive, and the adhesive is applied so that the application interval is different in each region. Is formed so that the basis weights of the adhesives in the central region 27C and the lateral region 27S are different from each other, or (2) the lateral joint portion 27b existing in the lateral region 27S is formed. The adhesive is applied so that the amount of the adhesive applied at the joint is larger than that of the central joint 27a existing in the central region 27C, and the adhesive is applied at the same intervals to the side of the central region 27C. The central region 27C and the lateral region 27S are formed so that the basis weights of the adhesive in the region 27S are different from each other, or (3) the coating amount and the coating interval of the adhesive are different from each other. An embodiment in which the basis weights of the adhesives in and out of the above are formed so as to be different from each other can be mentioned.

The diaper 1 may further include intermediate sheets 29 arranged on both side regions in the width direction Y. As shown in FIG. 3, the intermediate sheet 29 is located between the non-skin surface sheet 22 and the outer surface sheet 25. The intermediate sheet 29 is made of a liquid-resistant or water-repellent and breathable non-woven fabric. The intermediate sheet 29 is formed at least on the inseam M of the absorbent body 2.

In the intermediate sheet 29, the fixed end portion 29c along the longitudinal direction X is located between the non-skin surface sheet 22 and the outer surface sheet 25, and the free end portion 29a side is folded back toward the skin facing surface side of the absorber 23 to prevent it. A leak cuff is formed, and an elastic member 29b is arranged in an extended state on the free end 29S of the leak-proof cuff located on the free end 29a side, and has elasticity along the longitudinal direction X. The intermediate sheet 29 can stand up toward the wearer's skin starting from both side edges or the vicinity thereof in the width direction Y of the absorber 23 due to the contraction of the elastic member 29b. The elastic member 29b is arranged along the longitudinal direction X and is fixed to the intermediate sheet 29 in an extended state. The fixed end portion 29c of the intermediate sheet 29 located on the side edge opposite to the free end portion 29a is located and joined between the non-skin surface sheet 22 and the outer surface sheet 25 in the absorbent main body 2.

Further, as shown in FIGS. 3A and 3B, the fixed end portion 29c has a second joint portion 27A in which the non-skin surface sheet 22 and the intermediate sheet 29 are bonded by an adhesive. The second joint portion 27A is formed by joining the non-skin surface sheet 22 and the intermediate sheet 29, and is formed so as to overlap the side joint portion 27b in the thickness direction Z. Further, the region where the second joint portion 2A is formed and the lateral region 27S are formed so as to overlap each other in the thickness direction Z.

According to the diaper 1 of the present embodiment having such a configuration, immediately after wearing the diaper, no member such as a pocket is formed on the outer surface of the diaper, so that the diaper has a neat appearance with few irregularities and its appearance. Will be good. Further, after excretion of relatively heavy excrement such as stool, the central region in the width direction of the absorber is deformed so as to protrude outward to form a pocket 1P that can be accommodated so as to wrap the stool. As shown in FIG. 6, even moist stool can be successfully retained in the central region of the absorber in the width direction, and as a result, stool leakage can be prevented. The reason why the central region in the width direction of the absorber is deformed is that the absorber has a low basis weight portion, and the low basis weight portion is easily deformed. This is because the basis weight of the adhesive is lower than that of the lateral region 27S where the lateral joint portion 27a is present, so that the central region in the width direction of the non-skin surface sheet 22 and the outer surface sheet 25 is also easily deformed.

It is preferable that the joint portion 27 described above has a length along the longitudinal direction X longer than that of the low basis weight portion 2L. By having such a configuration, it is possible to form a pocket 1P that can hold the excrement so as to wrap it in the entire area of the low basis weight portion 2L, and to prevent the excrement from leaking more effectively.

The central region 27C is preferably formed in a range of 40% or more and 70% or less with respect to the total length of the absorber 23 in the width direction Y with the central portion of the absorber 23 interposed therebetween. It is preferable that the absorber 23 is formed in a range of 15% or more and 30% or less from both side edges of the absorber 23 with respect to the total length in the width direction Y. By having such a configuration, the rigidity of the lateral region 27S in which the lateral joint portion 27b exists can be increased, and the pocket 1P for accommodating stool can be more easily formed. The boundary between the central region 27C and the lateral region 27S is defined as the widthwise central end of the lateral joint 27b located on the central side in the width direction Y in the lateral region 27S, and is defined as the lateral region 27S. The outer end in the width direction of the absorber 23 is defined as the end portion in the width direction of the absorber 23.

The ratio (B / A) of the basis weight (B) of the adhesive in the side region 27S where the side joint portion 27b is present is the ratio (B / A) of the basis weight (A) of the adhesive in the central region 27C where the central joint portion 27a is present. , 1.3 or more, more preferably 1.5 or more, further preferably 3.0 or more, more preferably 100 or less, and even more preferably 80 or less. , 50 or less is more preferable. Specifically, the ratio of the basis weight (B) of the adhesive in the lateral region 27S where the side joint portion 27b is present to the basis weight (A) of the adhesive in the central region 27C where the central joint portion 27a is present (A). B / A) is preferably 1.3 or more and 100 or less, more preferably 1.5 or more and 80 or less, and further preferably 3.0 or more and 50 or less. The basis weight of the adhesive in each region is based on the area in the plan view of each region. By having such a configuration, the rigidity of the lateral joint portion 27b can be further increased, and the pocket 1P for accommodating the stool can be formed more successfully.

From the same viewpoint, the basis weight of the adhesive in the central region 27C where the central joint portion 27a is present ^{is preferably 0.1 g / m 2} or more, preferably 0.3 g / m 2 or more, provided that the above ratio is satisfied. more preferably m ² or more, further preferably 0.5 g / ^{m 2} or more, and is preferably from 10 g / ^{m 2,} more preferably 8 g / ^{m 2} or less, 1 g / It is more preferably m ^{2 or less.} Similarly, the basis weight of the adhesive in the lateral region 27S where the lateral joint portion 27b is present ^{is preferably 0.5 g / m 2} or more, preferably 0.7 g / m 2 or more, provided that the above ratio is satisfied. more preferably m ² or more, further preferably 1 g / ^{m 2} or more and is preferably 15 g / ^{m 2} or less, more preferably 10 g / ^{m 2} or less, 2 g / ^{m 2} The following is more preferable. The measurement of the basis weight in each region can be obtained by cutting out the region to be measured and using it as a sample, and dividing the ^{area (m 2) in the plan view of the sample from the amount (g) of the adhesive applied.}

As shown in FIG. 5, it is preferable that the number of lateral joints 27b extending in the longitudinal direction X is larger than the number of central joints 27a extending in the longitudinal direction X. By having such a configuration, it is possible to further increase the rigidity of the lateral joint portion 27b and to perform ventilation from the central region in the width direction in which the joint portion 27 is relatively small, so that the pocket 1P can be easily formed. It is possible to achieve both sex and suppression of stuffiness when worn.

Each of the joints 27 shown in FIG. 5 is formed in a streak shape along the longitudinal direction X, and for example, a strip-shaped (striped), spiral-shaped, or omega-shaped joint pattern having a constant width can be adopted. .. Each joint 27 can be formed continuously or discontinuously over the entire longitudinal direction X of the outer sheet 25.

In particular, as shown in FIG. 7, the joint portion 27 is preferably formed intermittently in the longitudinal direction X. In the joint portion 27 shown in the figure, both the central joint portion 27a and the side joint portion 27b are intermittent, but only one of these joint portions may be formed intermittently. .. By having such a configuration, it is possible to improve the flexibility of the diaper 1 itself while increasing the rigidity of the lateral joint portion 27b and facilitating the formation of the pocket 1P.

It is also preferable that the second joint portion 27A is formed in a strip shape or a spiral shape along the longitudinal direction X, similarly to the joint portion 27 described above. By having such a configuration, the rigidity of the lateral region of the absorber is further increased, the central region of the absorber is easily deformed, and a pocket for holding stool is easily formed. Can be done. As a result, excrement is successfully retained in the pocket and leakage can be prevented.

From the viewpoint of ease of forming a pocket, the absorber 23 is formed of a single layer, and it is also preferable that the absorber 23 has the above-mentioned low basis weight portion 2L. Examples of the form of the absorber 23 having a single layer and the low basis weight portion 2L include a form having the side surface as shown in FIG. 4B and the thickness of the absorber 23 is gradually reduced.

In the absorber 23, it is preferable that the shrinkage rate of the low basis weight portion 2L in the longitudinal direction X is higher than the shrinkage rate of the other region. As such a configuration, for example, an elastic absorber described in Japanese Patent Application Laid-Open No. 2009-136998 is used, and a structure formed so that the shrinkage ratio differs between the low basis weight portion 2L and the other portions is adopted. can do. By having such a configuration, it is possible to prevent the leakage of excrement by achieving both the followability of the wearer and the deformability to the excrement.

As shown in FIG. 3, it is preferable that the position of the elastic member 29b in the extended state overlaps with the central region 27C in which the central joint portion 27a exists in the thickness direction Z. When a plurality of elastic members 29b are present, at least one of the plurality of elastic members 29b may overlap with the central region 27C in which the central joint portion 27a is present in the thickness direction Z. By having such a configuration, the rise of the leak-proof cuff by the intermediate sheet 29 can be further improved, and lateral leakage of excrement can be prevented.

Returning to FIG. 1, at least one of the second elastic members 33 arranged around the waist W of the diaper 1 and the low basis weight portion 2L of the absorber 23 are arranged so as to overlap in the thickness direction Z. It is preferable that it is. That is, in the unfolded and extended state of the diaper 1 shown in FIG. 2, the low basis weight portion 2L exists at the position where the second elastic member 33 is arranged on the back side portion R of the diaper. preferable. By having such a configuration, the three-dimensional deformation of the absorber 23 can be further facilitated by the contraction of the second elastic member 33, and the leakage of stool can be further prevented.

In particular, it is preferable that at least one of the second elastic members 33 existing at a position overlapping the low basis weight portion 2L in the thickness direction is cut into a plurality of members so as not to exhibit elasticity. Such processing corresponds to the position where the low basis weight portion 2L of the absorber 23 is arranged by using, for example, the elastic member dividing portion used in the method for manufacturing the composite elastic member described in JP-A-2002-253605. It can be done by pressing the second elastic member 33. With such a configuration, excessive compression in the thickness direction due to the contraction of the second elastic member 33 is suppressed, the three-dimensional deformation of the absorber is further facilitated, and leakage of excrement is prevented. Can be prevented.

Further, the second elastic member 33P cut by the above-mentioned treatment has an elastic member joint 35 whose both ends are joined by an adhesive, and the elastic member joint 35 and the side joint 35. It is preferable that 27b and 27b overlap in the thickness direction Z. By having such a configuration, the rigidity of the lateral region of the absorber 23 is further increased, so that the three-dimensional deformation of the absorber becomes easier and the leakage of stool can be effectively prevented.

In addition, the gap between the back of the wearer and the waist circumference W on the back side R is minimized, and the three-dimensional deformation of the absorber 23 is facilitated to prevent leakage of excrement from the longitudinal direction and the width direction. From the viewpoint of prevention, it is preferable that the uncut second elastic member 33 is on the dorsal end 1E side of the cut second elastic member 33P.

8 and 9 show another embodiment of the absorber in the diaper of the present invention. In the following description, only the parts different from the above-described embodiment will be described, and the above-mentioned description will be appropriately applied to the other parts. Further, the same members as those in the above-described embodiment are designated by the same reference numerals.

The diaper 1 shown in FIG. 8 includes an absorber 23 having a plurality of low-rigidity portions 2S extending along the longitudinal direction X. The low-rigidity portion 2S shown in FIG. 9 does not have a material for forming the absorbent core 231 in the absorber 23, and is an open portion penetrating in the thickness direction thereof. Instead of this, the low-rigidity portion 2S may be replaced with a form in which the material for forming the absorbent core 231 is present and has a lower basis weight or a thinner thickness than other regions in the absorber 23. The low-rigidity portions 2S and 2S are positioned so as to overlap the central joint portion 27a in the thickness direction Z. It is preferable that the low-rigidity portion 2S shown in the figure is formed at least in the crotch portion M of the absorber and extends beyond the crotch portion M to the ventral side F and the dorsal side R. By having such a configuration, at the time of excretion, the absorber 23 can be three-dimensionally deformed with each low-rigidity portion 2S as a bending axis to form a pocket capable of holding excrement. As a result, stool can be more successfully retained in the central region of the absorber and leakage can be prevented more effectively.

The width of one low-rigidity portion 2S in the width direction Y is preferably larger than the width of one joint portion 27 existing in the lateral joint portion 27b in the width direction Y. Further, it is also preferable that the width of one low-rigidity portion 2S in the width direction Y is smaller than the total width of the lateral joint portion 27b in the width direction Y. By having such a configuration, it is possible to achieve both improvement of the three-dimensional deformability of the absorber 23 and suppression of unintended leakage of excrement through the low-rigidity portion 2S.

Specifically, the width W1 (see FIG. 9) of the low-rigidity portion 2S in the width direction Y is preferably 0.5 mm or more, preferably 5 mm or more, although it depends on the width and thickness of the absorber 23. Is more preferable, and it is preferably 20 mm or less, and further preferably 15 mm or less. Further, the width of the joint portion 27 existing in the lateral joint portion 27b in the width direction Y is preferably 0.5 mm or more, more preferably 0.8 mm or more, more preferably 5 mm or less, still more preferably 2 mm or less per one. It is preferable that it is formed so as to be.

As shown in FIG. 8, in the cross-sectional view in the diaper width direction Y, the positions of the outer edges 27L and the low-rigidity portion 2S in the width direction Y of the central region 27C in which the central joint portion 27a is formed overlap in the thickness direction. It is preferable that it exists. That is, it is preferable that the boundary portion 27L between the central region 27C and the side region 27S overlaps the position of the low-rigidity portion 2S in the thickness direction. By having such a configuration, the portion of the absorber 23 having a different basis weight of the adhesive and the low-rigidity portion 2S can be deformed so as to be substantially aligned with each other. It is possible to increase the formation efficiency of the stool and effectively prevent the leakage of stool.

From the same viewpoint, as shown in FIG. 9, it is also preferable that the low rigidity portion 2S is present at least in the low basis weight portion 2L. That is, it is also preferable that the low rigidity portion 2S extends to the portion where the low basis weight portion 2L exists. Further, the high basis weight portion 2H shown in the figure is preferably located outside the diaper longitudinal direction X with respect to the low basis weight portion 2L, and is preferably formed so as to be located on the dorsal side R side. By having such a configuration, the pocket is three-dimensionally formed by the deformation of the low basis weight portion 2L to successfully hold the stool and prevent the wearer from leaking from the front-back direction more effectively. be able to.

From the viewpoint of facilitating the three-dimensional formation of pockets capable of holding excrement in the absorber and preventing leakage, in the cross-sectional view of the diaper width direction Y, the width direction end from the width direction central portion CL of the absorber 23. The ratio (T2 / T1) of the length T2 from the central portion CL in the width direction to the outer portion in the width direction of the low-rigidity portion 2S with respect to the length T1 to the portion (see FIG. 9) is 0.4 or more. It is preferably 0.5 or more, more preferably 0.6 or more, still preferably 0.9 or less, more preferably 0.8 or less, and 0.7 or less. Is more preferable. Specifically, it is preferably 0.4 or more and 0.9 or less, more preferably 0.5 or more and 0.8 or less, and further preferably 0.6 or more and 0.7 or less.

Specifically, the length T1 from the width direction central portion CL to the width direction end portion of the absorber 23 is preferably 35 mm or more, more preferably 50 mm or more, and preferably 75 mm or less. , 65 mm or less is more preferable. Further, the length T2 from the central portion CL in the width direction to the outer end portion in the width direction of the low rigidity portion 2S is preferably 20 mm or more, more preferably 30 mm or more, and preferably 50 mm or less. , 40 mm or less is more preferable.

The disposable diaper having the above configuration can be a deployable type or a pants type disposable diaper. From the viewpoint of convenience of wearing by the wearer and the wearing assistant, the pants type as shown in FIGS. 1 and 6 is preferable. As the pants-type disposable diaper, the exterior body 3 may be divided into a ventral exterior body and a dorsal exterior body, and instead, the exterior body 3 is divided from the ventral side F to the crotch M. It may be an embodiment arranged so as to extend to the dorsal side R through the above. In any case, the disposable diaper of the present invention has a good appearance immediately after wearing the diaper, and after excretion of excrement such as feces, the absorber is removed as shown in FIG. Since the pocket 1P is formed so as to project toward the direction, the stool can be absorbed and held in the pocket 1P to suppress the leakage of the stool.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the above-described embodiment. For example, the low-rigidity portion 2S shown in FIG. 9 may be formed on the absorber 23 shown in FIG. 4 (a).

Regarding the above-described embodiment of the present invention, the following pants-type disposable diapers and a method for manufacturing the same are further disclosed.
<1>
An absorber, a non-skin surface sheet arranged on the non-skin facing surface side of the absorber, and an outer surface sheet arranged on the non-skin facing surface side of the non-skin surface sheet are provided, and the wearer's belly is provided in a wearing state. A disposable diaper having a ventral side arranged on the side, a crotch part arranged on the crotch part, and a dorsal part arranged on the dorsal side.
The absorber has a low basis weight portion at any position from the inseam to the dorsal portion, the basis weight of which is relatively lower than that of other parts of the absorber.
The outer surface sheet and the sheet located on the skin-facing surface side of the outer surface sheet are joined by an adhesive, whereby a plurality of joints extending in the longitudinal direction of the diaper are formed.
The plurality of joints are located in a region overlapping the low basis weight portion in the thickness direction.
Of the regions, the lateral regions located on both sides in the diaper width direction are disposable diapers in which the basis weight of the adhesive is higher than that in the central region located in the central region in the width direction.

<2>
The disposable diaper according to <1>, wherein the joint portion has a length along the longitudinal direction of the diaper longer than that of the low basis weight portion.
<3>
The disposable diaper according to <1> or <2>, wherein the ratio of the basis weight of the adhesive in the lateral region to the basis weight of the adhesive in the central region is 1.3 or more and 100 or less.
<4>
The ratio of the basis weight of the adhesive in the lateral region to the basis weight of the adhesive in the central region is preferably 1.3 or more, more preferably 1.5 or more, and 3.0 or more. The disposable item according to any one of <1> to <3>, wherein the amount is more preferably 100 or less, more preferably 80 or less, still more preferably 50 or less. Diapers.
<5>
The basis weight of the adhesive in the central region ^{is preferably 0.1 g / m 2} or more, more preferably 0.3 g / m ² or more, provided that the above ratio is satisfied, and 0. 5 g / m ² or more is further preferable, 10 g / m ² or less is preferable, 8 g / m ² or less is more preferable, and 1 g / m ² or less is further preferable. The disposable diaper described in 4>.

<6>
The basis weight of the adhesive in the lateral region ^{is preferably 0.5 g / m 2} or more, more preferably 0.7 g / m ² or more, provided that the above ratio is satisfied, and 1 g. / more preferably ^m is ² or more, and is preferably 15 g / ^{m 2} or less, more preferably 10 g / ^{m 2} or less, still more preferably 2 g / ^{m 2} or less, wherein <4 > Or the disposable diaper according to <5>.
<7>
The disposable diaper according to any one of <1> to <6>, wherein the number of the joints formed in the lateral region is larger than the number of the joints formed in the central region. ..
<8>
The disposable diaper according to any one of <1> to <7>, wherein the joint is intermittently formed in the longitudinal direction of the diaper.
<9>
The disposable diaper according to any one of <1> to <8>, wherein the absorber is a single layer.

<10>
The disposable diaper according to any one of <1> to <9>, wherein the absorber has a single low basis weight portion only in the entire longitudinal direction and width direction of the dorsal side portion.
<11>
The disposable diaper according to any one of <1> to <10>, wherein the low basis weight portion gradually decreases in thickness toward the edge of the dorsal side portion.
<12>
An intermediate sheet located between the non-skin surface sheet and the outer surface sheet is provided.
It has a second joint portion in which the non-skin surface sheet and the intermediate sheet are bonded by an adhesive.
The disposable diaper according to any one of <1> to <11>, wherein the region where the second joint is formed and the lateral region are located so as to overlap each other in the thickness direction.
<13>
The intermediate seats are arranged on both sides in the diaper width direction.
The outer surface sheet is joined to the non-skin surface sheet in the central region in the diaper width direction to form the joint portion in the central region, and is joined to the intermediate sheet in both side regions in the diaper width direction to form the joint. The disposable diaper according to <12>, wherein the portion is formed in the lateral region.

<14>
The disposable diaper according to <12> or <13>, wherein the second joint and the joint formed in the lateral region are located so as to overlap each other in the thickness direction.
<15>
The disposable diaper according to any one of <12> to <14>, wherein the second joint is formed in a plurality of strip-shaped or spiral-shaped strips along the longitudinal direction of the diaper.
<16>
In the intermediate sheet, one side area along the longitudinal direction of the diaper of the intermediate sheet is located between the non-skin surface sheet and the outer surface sheet, and the other side area side is the skin-facing surface side of the absorber. The disposable diaper according to any one of <12> to <15>, wherein an elastic member is arranged in an extended state at a free end of the leak-proof cuff.
<17>
The disposable diaper according to <16>, wherein the position of the elastic member in the extended state overlaps with the central region in the thickness direction.

<18>
The absorber has a plurality of low-rigidity portions extending along its longitudinal direction.
The disposable diaper according to any one of <1> to <17>, wherein each of the low-rigidity portions overlaps with the joint portion formed in the central region in the thickness direction.
<19>
The disposable diaper according to <18>, wherein the width of one of the low-rigidity portions is larger than the width of one of the joint portions formed in the lateral region.
<20>
The disposable diaper according to <18> or <19>, wherein the width of one of the low-rigidity portions is smaller than the total width of the joint portions formed in the lateral region.
<21>
In the diaper width direction cross-sectional view, from the width direction center portion of the absorber to the width direction outer portion of the low rigidity portion with respect to the length from the width direction center portion of the absorber to the width direction end portion of the absorber. The disposable diaper according to any one of <18> to <20>, wherein the length ratio is 0.4 or more and 0.9 or less.

<22>
In the cross-sectional view in the diaper width direction, the ratio of the length from the center portion in the width direction to the outer portion in the width direction of the low rigidity portion to the length from the center portion in the width direction to the end portion in the width direction of the absorber is calculated. It is preferably 0.4 or more, more preferably 0.5 or more, further preferably 0.6 or more, and preferably 0.9 or less, preferably 0.8 or less. The disposable diaper according to any one of <18> to <21>, wherein is more preferably 0.7 or less.
<23>
The length from the center portion in the width direction to the end portion in the width direction of the absorber is preferably 35 mm or more, more preferably 50 mm or more, and preferably 75 mm or less, and preferably 65 mm or less. The disposable diaper according to any one of <18> to <22>, which is more preferable.
<24>
The length from the center portion in the width direction of the absorber to the outer end portion in the width direction of the low rigidity portion 2S is preferably 20 mm or more, more preferably 30 mm or more, and more preferably 50 mm or less. The disposable diaper according to any one of <18> to <23>, more preferably 40 mm or less.
<25>
The disposable diaper according to any one of <18> to <24>, wherein each outer edge of the joint formed in the central region and the low-rigidity portion overlap in the thickness direction.

<26>
The disposable diaper according to any one of <18> to <25>, wherein the low-rigidity portion is present at least in the low basis weight portion.
<27>
The disposable diaper according to any one of <18> to <26>, wherein the low-rigidity portion does not contain a material for forming an absorbent core in the absorber.
<28>
The width of the low-rigidity portion in the width direction is preferably 0.5 mm or more, more preferably 5 mm or more, still more preferably 20 mm or less, still more preferably 15 mm or less. The disposable diaper according to any one of 18> to <27>.
<29>
The disposable diaper according to any one of <18> to <28>, wherein the low-rigidity portion preferably extends to a portion where the low basis weight portion exists.

<30>
An exterior body is provided on the non-skin facing surface side of the outer surface sheet.
The exterior body has an inner-layer non-woven fabric arranged on the non-skin facing surface side of the outer surface sheet and an outer-layer non-woven fabric arranged on the non-skin facing surface side of the inner layer non-woven fabric.
A plurality of second elastic members extending along the diaper width direction are arranged between the outer-layer non-woven fabric and the inner-layer non-woven fabric.
At least one of the second elastic members and the low basis weight portion are arranged so as to overlap in the thickness direction to form waist gathers extending along the diaper width direction. The disposable diaper described in any one of>.
<31>
The disposable diaper according to <30>, wherein at least one of the second elastic members existing at a position overlapping the low basis weight portion in the thickness direction is cut so as not to exhibit elasticity.
<32>
Both ends of the cut second elastic member have elastic member joints joined to the exterior body by an adhesive, and the elastic member joints and the joints formed in the lateral region are thick. The disposable diaper according to <30> or <31>, which overlaps in the direction.
<33>
The disposable diaper according to any one of <30> to <32>, wherein the uncut second elastic member is located on the dorsal end side of the cut second elastic member.
<34>
The disposable diaper according to any one of <1> to <33>, wherein the absorber has a high basis weight portion having a basis weight higher than that of the low basis weight portion on the back side of the low basis weight portion. ..
<35>
The disposable diaper according to any one of <1> to <34>, wherein the shrinkage rate of the low basis weight portion in the longitudinal direction of the diaper is higher than the shrinkage rate of the other region of the absorber.
<36>
The central region is formed in a range of 40% or more and 70% or less with respect to the total length in the width direction of the absorber with the central portion of the absorber in between.
Any of the above <1> to <35>, the lateral region is formed in a range of 15% or more and 30% or less from both side edges of the absorber with respect to the total length in the width direction of the absorber. The disposable diaper described in Kaichi.

<37>
An exterior body is provided on the non-skin facing surface side of the outer surface sheet.
The exterior body is divided into a dorsal exterior body arranged on the back side of the wearer and a ventral exterior body arranged on the ventral side.
The disposable diaper according to any one of <1> to <36>, wherein the absorbent body including the absorber is bridged and fixed between the dorsal exterior body and the ventral exterior body. ..
<38>
The disposable diaper according to any one of <1> to <37>, which is a pants type.

According to the present invention, there is provided a disposable diaper that can prevent stool leakage without impairing the appearance when worn.

Claims (26)

An absorber, a non-skin surface sheet arranged on the non-skin facing surface side of the absorber, and an outer surface sheet arranged on the non-skin facing surface side of the non-skin surface sheet are provided, and the wearer's belly is provided in a wearing state. A disposable diaper having a ventral side arranged on the side, a crotch part arranged on the crotch part, and a dorsal part arranged on the dorsal side.
The absorber has a low basis weight portion at any position from the inseam to the dorsal portion, the basis weight of which is relatively lower than that of other parts of the absorber.
The outer surface sheet and the sheet located on the skin-facing surface side of the outer surface sheet are joined by an adhesive, whereby a plurality of joints extending in the longitudinal direction of the diaper are formed.
The plurality of joints are located in a region overlapping the low basis weight portion in the thickness direction.
Of the regions, the lateral regions located on both sides in the diaper width direction are disposable diapers in which the basis weight of the adhesive is higher than that in the central region located in the central region in the width direction. The disposable diaper according to claim 1, wherein the joint portion has a length along the longitudinal direction of the diaper longer than the low basis weight portion. The disposable diaper according to claim 1 or 2, wherein the ratio of the basis weight of the adhesive in the lateral region to the basis weight of the adhesive in the central region is 1.3 or more and 100 or less. The disposable diaper according to any one of claims 1 to 3, wherein the number of the joints formed in the lateral region is larger than the number of the joints formed in the central region. The disposable diaper according to any one of claims 1 to 4, wherein the joint is intermittently formed in the longitudinal direction of the diaper. The disposable diaper according to any one of claims 1 to 5, wherein the absorber is a single layer. An intermediate sheet located between the non-skin surface sheet and the outer surface sheet is provided.
It has a second joint portion in which the non-skin surface sheet and the intermediate sheet are bonded by an adhesive.
The disposable diaper according to any one of claims 1 to 6, wherein the region where the second joint is formed and the lateral region are located so as to overlap each other in the thickness direction. The intermediate seats are arranged on both sides in the diaper width direction.
The outer surface sheet is joined to the non-skin surface sheet in the central region in the diaper width direction to form the joint portion in the central region, and is joined to the intermediate sheet in both side regions in the diaper width direction to form the joint. The disposable diaper according to claim 7, wherein the portion is formed in the lateral region. The disposable diaper according to claim 7 or 8, wherein the second joint and the joint formed in the lateral region are located so as to overlap each other in the thickness direction. The disposable diaper according to any one of claims 7 to 9, wherein the second joint is formed in a plurality of strip-shaped or spiral-shaped strips along the longitudinal direction of the diaper. In the intermediate sheet, one side area along the longitudinal direction of the diaper of the intermediate sheet is located between the non-skin surface sheet and the outer surface sheet, and the other side area side is the skin-facing surface side of the absorber. The disposable diaper according to any one of claims 7 to 10, wherein the diaper is folded back to form a leak-proof cuff, and an elastic member is arranged at the free end of the leak-proof cuff in an extended state. The disposable diaper according to claim 11, wherein the position of the elastic member in the extended state overlaps with the central region in the thickness direction. The absorber has a plurality of low-rigidity portions extending along its longitudinal direction.
The disposable diaper according to any one of claims 1 to 12, wherein each of the low-rigidity portions overlaps with the joint portion formed in the central region in the thickness direction. The disposable diaper according to claim 13, wherein the width of one of the low-rigidity portions is larger than the width of one of the joint portions formed in the lateral region. The disposable diaper according to claim 13 or 14, wherein the width of one of the low-rigidity portions is smaller than the total width of the joints formed in the lateral region. In the diaper width direction cross-sectional view, from the width direction center portion of the absorber to the width direction outer portion of the low rigidity portion with respect to the length from the width direction center portion of the absorber to the width direction end portion of the absorber. The disposable diaper according to any one of claims 13 to 15, wherein the length ratio is 0.4 or more and 0.9 or less. The disposable diaper according to any one of claims 13 to 16, wherein each outer edge of the joint portion formed in the central region and the low-rigidity portion overlap in the thickness direction. The disposable diaper according to any one of claims 13 to 17, wherein the low-rigidity portion is present at least in the low basis weight portion. An exterior body is provided on the non-skin facing surface side of the outer surface sheet.
The exterior body has an inner-layer non-woven fabric arranged on the non-skin facing surface side of the outer surface sheet and an outer-layer non-woven fabric arranged on the non-skin facing surface side of the inner layer non-woven fabric.
A plurality of second elastic members extending along the diaper width direction are arranged between the outer-layer non-woven fabric and the inner-layer non-woven fabric.
7. The disposable diaper described in item 1. The disposable diaper according to claim 19, wherein at least one of the second elastic members existing at a position overlapping the low basis weight portion in the thickness direction is cut so as not to exhibit elasticity. Both ends of the cut second elastic member have elastic member joints joined to the exterior body by an adhesive, and the elastic member joints and the joints formed in the lateral region are thick. The disposable diaper according to claim 20, which overlaps in the direction. The disposable diaper according to claim 20 or 21, wherein the uncut second elastic member is located on the dorsal end side of the cut second elastic member. The disposable diaper according to any one of claims 1 to 22, wherein the absorber has a high basis weight portion having a basis weight higher than that of the low basis weight portion on the back side of the low basis weight portion. The disposable diaper according to any one of claims 1 to 23, wherein the shrinkage rate of the low basis weight portion in the longitudinal direction of the diaper is higher than the shrinkage rate of the other region of the absorber. The central region is formed in a range of 40% or more and 70% or less with respect to the total length in the width direction of the absorber with the central portion of the absorber in between.
Any one of claims 1 to 24, wherein the lateral region is formed in a range of 15% or more and 30% or less from both side edges of the absorber with respect to the total length in the width direction of the absorber. Disposable diapers listed in. The disposable diaper according to any one of claims 1 to 25, which is a pants type.

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